From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 9 Dec 2022 21:00:40 +0000 (+0200)
Subject: Use a static local variable for assigning packet IDs
X-Git-Url: http://git.tdb.fi/?p=libs%2Fnet.git;a=commitdiff_plain;h=ee01d294f9078fbf17dc6a0a645ad3a342c49b1a

Use a static local variable for assigning packet IDs

This avoids the need of a definition for the static member variable of
a template class.
---

diff --git a/source/net/communicator.cpp b/source/net/communicator.cpp
index c473d53..f74f4d3 100644
--- a/source/net/communicator.cpp
+++ b/source/net/communicator.cpp
@@ -1,6 +1,5 @@
 #include <cstring>
 #include "communicator.h"
-#include "protocol_impl.h"
 #include "streamsocket.h"
 
 using namespace std;
diff --git a/source/net/protocol.cpp b/source/net/protocol.cpp
index 17e4310..db66382 100644
--- a/source/net/protocol.cpp
+++ b/source/net/protocol.cpp
@@ -5,7 +5,6 @@
 #include <msp/strings/format.h>
 #include <msp/strings/lexicalcast.h>
 #include "protocol.h"
-#include "protocol_impl.h"
 
 using namespace std;
 
@@ -26,6 +25,12 @@ Protocol::~Protocol()
 		delete i->second;
 }
 
+unsigned Protocol::get_next_packet_class_id()
+{
+	static unsigned next_id = 1;
+	return next_id++;
+}
+
 void Protocol::add_packet(PacketDefBase *pdef)
 {
 	PacketDefBase *&ptr = packet_class_defs[pdef->get_class_id()];
@@ -154,8 +159,6 @@ const char *Protocol::StringSerializer::deserialize(string &str, const char *buf
 }
 
 
-unsigned Protocol::PacketDefBase::next_class_id = 1;
-
 Protocol::PacketDefBase::PacketDefBase(unsigned i):
 	id(i)
 { }
diff --git a/source/net/protocol.h b/source/net/protocol.h
index fa90e6d..cd68d51 100644
--- a/source/net/protocol.h
+++ b/source/net/protocol.h
@@ -163,8 +163,6 @@ private:
 	protected:
 		unsigned id;
 
-		static unsigned next_class_id;
-
 		PacketDefBase(unsigned);
 	public:
 		virtual ~PacketDefBase() { }
@@ -180,14 +178,11 @@ private:
 	private:
 		CompoundTypeDef<P> *compound;
 
-		static unsigned class_id;
-
 	public:
 		PacketTypeDef(unsigned);
 		~PacketTypeDef();
 
-		static unsigned get_static_class_id() { return class_id; }
-		virtual unsigned get_class_id() const { return class_id; }
+		virtual unsigned get_class_id() const { return get_packet_class_id<P>(); }
 
 		template<typename S>
 		void set_serializer(const S &);
@@ -237,6 +232,11 @@ public:
 	~Protocol();
 
 private:
+	static unsigned get_next_packet_class_id();
+
+	template<typename P>
+	static unsigned get_packet_class_id();
+
 	void add_packet(PacketDefBase *);
 
 protected:
@@ -267,6 +267,13 @@ private:
 };
 
 
+template<typename P>
+unsigned Protocol::get_packet_class_id()
+{
+	static unsigned id = get_next_packet_class_id();
+	return id;
+}
+
 template<typename P>
 Protocol::PacketDefBuilder<P, Protocol::NullSerializer<P> > Protocol::add(unsigned id)
 {
@@ -284,7 +291,7 @@ Protocol::PacketDefBuilder<P, Protocol::NullSerializer<P> > Protocol::add()
 template<typename P>
 const Protocol::PacketTypeDef<P> &Protocol::get_packet_by_class() const
 {
-	const PacketDefBase &pdef = get_packet_by_class_id(PacketTypeDef<P>::get_static_class_id());
+	const PacketDefBase &pdef = get_packet_by_class_id(get_packet_class_id<P>());
 	return static_cast<const PacketTypeDef<P> &>(pdef);
 }
 
@@ -460,10 +467,7 @@ template<typename P>
 Protocol::PacketTypeDef<P>::PacketTypeDef(unsigned i):
 	PacketDefBase(i),
 	compound(new CompoundDef<P, NullSerializer<P> >(NullSerializer<P>()))
-{
-	if(!class_id)
-		class_id = next_class_id++;
-}
+{ }
 
 template<typename P>
 Protocol::PacketTypeDef<P>::~PacketTypeDef()
diff --git a/source/net/protocol_impl.h b/source/net/protocol_impl.h
index 9ddf818..4eb2861 100644
--- a/source/net/protocol_impl.h
+++ b/source/net/protocol_impl.h
@@ -1,15 +1,6 @@
 #ifndef MSP_NET_PROTOCOL_IMPL_H_
 #define MSP_NET_PROTOCOL_IMPL_H_
 
-#include "protocol.h"
-
-namespace Msp {
-namespace Net {
-
-template<typename P>
-unsigned Protocol::PacketTypeDef<P>::class_id = 0;
-
-} // namespace Net
-} // namespace Msp
+#warning "This header is deprected and should not be used"
 
 #endif